Number 142 July 9. 1923 OCCASIONAL PAPERS OF THE MUSEUM OF ZOOLOGY UNIVERSITY OF MICHIGAN Ann Arbor, Michigan Published by the University COMMENTS ON RING-NECK SNAKES (GENUS DL^DOPHIS), WITH DIAGNOSES OF NEW FORMS^ By Frank N. Blanchard In the course of a study of the ring-neck snakes, genus Diadophis. it has been found necessary to alter considerably the present systematic arrangement of the western forms and to propose several new names for the designation of subspecies hitherto unrecognized. Diadophis rcgalis rcgalis ( Baird and Girard) 1853 Diadophis rcgalis Baird and Girard, Cat. N. Amer. Rept., pt. i, Serpents, p. 115. A studv of all the specimens and records of ring-neck snakes from western Texas to Arizona makes it appear highly prob-able that two races inhabit this territory, an eastern form, es-sentiallv without the neck ring, ranging to southeastern Ari-1 Contribution from the Department of Zoology of the Univer--,ity of Michigan.